EventArgs类和事件关键字之间是否存在特殊关联？

EventArgs

EventHandler

public class IoC
{
    public AbstractFactory GetAbstractFactory()
    {
        var factory = new AbstractFactory();
        factory.CreateObject += ()=>new object();
        return factory;
    }
}
public class AbstractFactory
{
    public event Func<object> CreateObject;

    private object OnObjectCreated()
    {
        if(CreateObject == null)
        {
            throw new Exception("Not injected.");
        }
        return CreateObject();
    }


    private object _injectedObject;
    public object InjectedObject
    {
        get
        {
            if(_injectedObject == null)
            {
                _injectedObject = OnObjectCreated();
            }
            return _injectedObject;
        }
    }
}